physics Mcqs
601. 1024 can be written in scientific notation as______________?
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A. 1.024103

B. 2 Raised to power 10

C. 0.000976

D. 1/0.00097

602. Bernoullis equation is applicable for_________________?
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A. Laminar flow

B. Turbulent flow

C. Both laminar and turbulent flow

D. None of these

603. The power of a concave lens is_______________?
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A. real

B. positive

C. negative

D. virtual

604. If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is______________?
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A. 2.8 ms-1

B. 1.6 rad. S-1

C. 4 rad. S-1

D. 5 rad. S-1
605. Compton effect proves the________________?
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A. Uncertain nature of light

B. Photon theory of light

C. Wave nature of light

D. Dual nature of light

606. In Davisson-Germer experiment the diffracted proton from crystal shows______________?
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A. Light property

B. Quantum property

C. Wave property

D. Particle property

607. As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?
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A. shifts towards shorter wavelength

B. remain the same

C. shifts towards longer as well as shorter wavelengths

D. shifts towards longer wavelength

608. The profile of aeroplane wing which lifts it up is called as_____________?
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A. Curved profile

B. Wing shape

C. None of these

D. Aerofoil profile
609. In case of a simple pendulum, the cause of damping is__________________?
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A. Drag force of air

B. None of these

C. Tension in the string

D. Gravity

610. A convex lens acts as a diverging lens if the_________________?
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A. object is beyond C

B. if the object is with in C

C. if the object is within f

D. both B and C
611. How many main frontiers of fundamental science ?
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A. 1

B. 3

C. 4

D. 2

612. A simple pendulum suspended from the ceiling of a lift has time period T when the lift is at rest. When the lift falls freely, the time period is_________________?
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A. T/g

B. g/T

C. Zero

D. Infinite
613. A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is_______________?
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A. mg + ma

B. mg ma

C. mg

D. mg ma

614. The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?
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A. Ke2/rn2

B. Ke2/rn

C. Ke2/rn

D. Ke2/rn2

615. Least distance of distinct vision_____________?
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A. neither increases nor decreases

B. becomes infinite after 60 years

C. decreases with increase in age

D. increases with increase in age
616. A three-dimensional image is obtained by________________?
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A. Electron microscope

B. Scanning electron microscope

C. Magnetic imaging

D. None of the above

617. When a body moves in a circle of radius r with linear speed V its centripetal force is_______________?
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A. mV2/r

B. mV/r

C. mV2/r2

D. mV/r2

618. The uncertainty in momentum & position is due to its_____________?
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A. Emission of the certain wavelength

B. Property of matter and radiation

C. Very high velocity

D. Two-dimensional motion

619. Two fog droplets have radius 2:3 their terminal velocities are_______________?
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A. 4.3

B. 4:06

C. 2:09

D. 4:09
620. Systolic pressure is called_______________?
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A. High blood pressure

B. Low blood pressure

C. Normal blood pressure

D. Abnormal blood pressure

621. If the wavelength of incident radiation is increased in photoemission then_________________?
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A. The minimum kinetic energy of the photoelectrons increases

B. The minimum kinetic energy of the photoelectrons decreases

C. The maximum kinetic energy of the photoelectrons increases

D. The average kinetic energy of the photoelectrons decreases
622. One radian is equal to______________?
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A. 57.3

B. 87.3

C. 67.3

D. 60

623. When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by______________?
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A. Velocity of body

B. Mass of a body

C. Centripetal acceleration

D. The tension in the string
624. In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?
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A. 20km

B. 200km

C. 100km

D. 300km

625. The penetrating power of X-rays depends on their______________?
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A. all of the above

B. applied voltage

C. source

D. frequency
626. Excited atoms return to their ground state in_______________?
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A. 10-9s

B. 10-6s

C. 10-10s

D. 10-8s
627. A cyclist cycling around a circular racing track skids because_____________?
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A. the centripetal force upon him is less than limiting friction

B. the centripetal force upon him is greater than limiting friction

C. the centripetal force upon him is equal to the limiting friction

D. the friction between the tyres of the cycle and road vanishes

628. One pico stands for_________________?
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A. 10 raised to power -15

B. 10 raised to power -9

C. 10 raised to power -12

D. 10 raised to power -6

629. The length of the second pendulum is________________?
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A. 100 cm

B. 99 cm

C. 99.2 cm

D. 98 cm

630. The velocity of a particle of mass m of de-Broglie wavelength ? is______________?
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A. v = 2 106 ms-1

B. v = 2 6 ms-1

C. v = 2 10 ms-1

D. v = 3 106 ms-1

631. A cup of milk is placed in a microwave oven. Tell which statements is false. (1) Milk will be heated up only. (2) Cup will remain cool. (3) Both cup and mild will get hot ?
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A. 3

B. 1

C. None

D. 2

632. Velocity of fluid increases where the pressure is________________?
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A. Changes continuously

B. Low

C. Constant

D. High

633. In multimode step index fibre the refractive index of core and cladding is____________?
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A. same

B. zero

C. different with refractive index of core higher than cladding

D. different

634. Total distance travelled by a bob of the simple pendulum in one vibration is equal to________________?
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A. 2 x amplitude

B. Amplitude

C. 4 x amplitude

D. Square of the amplitude

635. Which one is not a branch of physical sciences ?
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A. Geology

B. Chemistry

C. Astronomy

D. Biology
636. Number of significant figures in 0.0173 is_________________?
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A. 2

B. 5

C. 3

D. 4

637. When we excite some atoms by heat collision or electrical discharge they will________________?
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A. absorb particular wavelengths when white light is incident on them

B. radiate electromagnetic energy with a continuous distribution of wavelength

C. radiate electromagnetic energy of discrete characteristic wavelength

D. emit either invisible or visible light

638. In optic fiber transmission system _____________ are used regenerate the dim light signal?
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A. Laser

B. Repeaters

C. Transformer

D. Diodes

639. One torr is equal to_________________?
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A. .1333 Nm-2

B. 133.3 Nm2

C. 1.333 Nm-2

D. 13.33 Nm-2

640. A man standing near a fast moving train may fall___________?
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A. Towards the train

B. Away from the train

C. On himself

D. On the train

641. Which one is the derived quantity in SI units _____________?
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A. Plane angle

B. Electric charge

C. Electric current

D. Amount of substance

642. The dimension of force is__________________?
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A. MLT-2

B. MLT-1

C. ML-1T-2

D. ML-1T

643. The unit of force is _________ and its symbol is ______________ Which is the correct pair ?
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A. Newton, n

B. newton, N

C. newton, n

D. Newton, N

644. The radiations emitted form hydrogen filled discharge tube show____________?
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A. line spectrum

B. continuous spectrum

C. absorption spectrum

D. band spectrum

645. X-ray are________________?
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A. of unknown nature

B. radio isotopes

C. high energy electrons

D. high energy photons
646. A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is______________?
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A. Zero

B. Maximum

C. Less than the weight of the stone

D. Equal to the weight of the stone
647. How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit) ?
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A. 329 days

B. 129 days

C. 365 days

D. 730 days

648. A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?
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A. f2 + f1

B. f2 f1

C. f1f2/f2+f1

D. f1f2/f1-f2
649. The number of significant figures in the length of a bar 6200mm measured by meter rod is_______________?
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A. 3

B. 4

C. None of these

D. 2

650. If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?
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A. At the point where gravity is not acting

B. At any point during motion

C. At the lowest point

D. At the highest point